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How to add a GridView Column on code-behind? ASP.NET C#
gridViewPoco.Columns.Add(...)

<asp:BoundField>
<asp:TemplateField>

protected void Btn_AddCol_Click(object sender, EventArgs e)
    {
    TemplateField tf = new TemplateField();
    tf.HeaderTemplate = new GridViewLabelTemplate(DataControlRowType.Header, "Col1", "Int32");
    tf.ItemTemplate = new GridViewLabelTemplate(DataControlRowType.DataRow, "Col1", "Int32");
    MyGridView.Columns.Add(tf);
    }